Jordan and Ever maun. — Fishes of North America. 223 



Represented south of Virginia and Tennessee by 



3o5 a. SEMOTILrS ATROMACULATUS THOBEAUIANIIS (Jordan), 



Head 4; depth 4. D. 8; A. 7; scales 9-46*-5 ; teeth 2, 5-4, 2. Rather 

 stouter, with larger scales, less crowded forwards, 45 to 48 in lateral line; 

 the head short and thick, almost round. Barbel well developed. Color- 

 ation oi S. o^roHi(jc«?fl/«s, the black dorsal spot distinct. Length 7 inches. 

 Streams of Georgia and Alabama ; the extremes quite unlike atromaculaimi ; 

 intermediate specimens with scales 48 to 50 occurring in Cape Fear River 

 and elsewhere. (Named for Henry David Thoreau, t naturalist and poet.) 



Seniotilus thureauianus, Jordan, Bull. IT. S. Nat. Mus., x, 63, 1877, Flint River, Georgia. 

 (Type, No. 9296. Coll. Hugh M. Neisler.) 



113. POGONICHTHYS, Girard. 



Pogonichihijs, Girard, Proc. Ac. Nat. Sci. Phila., 1854, 13G, {inmjuilobm). 



Si/tnmeO-imi)-, Jordan, Bull. Ilayd^u Geol. Surv. Terr., iv, 788, 1878, («>-(/)/(eK)SU« = young). 



Body elongate ; head small, conical ; mouth moderate, terminal, normal ; 

 maxillary with a well-developed barbel at its end ; premaxillaries protrac- 

 tile. Teeth 2, 4-5, 2, or 2, 5-5, 2, hooked, with well-marked grinding sur- 

 face. Scales rather large ; lateral line continuous, decurved. Dorsal fin 

 beginning rather in advance of veutrals ; anal basis short. Caudal fin with 

 its rudimentary rays numerous and greatly developed, supported by strong 

 apophyses of the caudal vertebra-, the upper lobe of the fin considerably 

 longer than the lower, this character not evident in the young, appearing 

 by degrees. Intestinal canal short ; skeleton not peculiar, excejit in the 

 great development of the apophyses of last caudal vertebne. Chubs of 

 large size, replacing on the Pacific Slope, the eastern Semotilm. (n^yuv, 

 beard; IxOvc, fish.) 



356. POGONICHTHYS MACROLEPIDOTUS (Ayres). 

 (Split-tail.) 



Head 4^ ; depth 3i; eye large, 4J in head. D. 9; A. 8; scales 10-66-6; 

 vertebne 26+15; teeth 2, 5-5, 2, rarely 2, 6-5, 2. Body elongate, somewhat 

 compressed, back a little elevated. Head short, slender. Mouth mod- 

 erate, nearly horizontal, maxillary reaching orbit; lower jaw included; 

 preorbital longer than deep. Interorbital space convex. Dorsal fin mid- 

 way of body, rather in front of ventrals. Scales rather largo, moder- 

 ately imbricated. Lateral line decurved. Fins rather large; upper lobe 

 pf caudal half longer than head in adult, the lobes subequal in young. 

 Coloration uniform ; sides bright silvery, especially in young ; no red. 

 Length 12 inches. Lowland streams of central California; very common 

 in the Sacramento and San Joaquin. Singularly distinguished from our 



♦Scales 46 to 48 in the types from Flint Kiver ; 61 in specimen from Augusta, Georgia ; 52 in 

 one from Black AVarrior Kiver. 



t "The first to say a good word for the study of Cypriuida-." " I am the wiser in respect to 

 all knowledge and the bettcr.qualificd for all fortunes for knowing that there is a minnow in the 

 brook. Methinks I have need even of his sympathy and to be his fellow in a degree. I would 

 know even the number of their fin rays and how many scales compose the lateral line." 

 (2'horeau.) 



